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Abstract

Based on a series of 1x2 beam splitters, novel direct excitation of slow-light from input- to output-region in photonic crystal waveguides is investigated theoretically and experimentally. The study shows that the slow-light excitation provides over 50 nm bandwidth for TE-polarized light splitting between two output ports, and co-exists together with self-imaging leading to ~20 nm extra bandwidth. The intensity of the direct excitation is qualitatively explained by the overlap integral of the magnetic fields between the ground input- and excited output-modes. The direct excitation of slow light is practically lossless compared with transmission in a W1 photonic crystal waveguides, which broadens the application-field for slow-light and further minimizes the size of a 1x2 splitter.

Figures (5)

Dispersion diagram for the even guided TE polarization of the PhCWs calculated using 3D PWE method, where the right axis shows the corresponding wavelength, λ, in free space for Λ = 380 nm. a) the single W1 PhCW, b) the triple multimode region, and c) the dual waveguide output. The super-cells are shown in the insets. The upper cyan shaded band indicates the region where the MMI self-imaging can occur in MMI region and the gray part represents the region where the novel excitation may happen.